Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Strong interactions and Hadron Physics
Observation of simultaneous production of three $J/\psi$ mesons in pp collisions
J. Mejía
Full text: pdf
Pre-published on: October 18, 2022
Published on:
Abstract
This writeup presents the first observation of the simultaneous production of three $J/\psi$ mesons in proton-proton (pp) collisions, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 133 fb$^{-1}$. The $pp \to J/\psi\,J/\psi\,J/\psi\, X$ process is observed with a significance above five standard deviations in final states with three $\mu^{+}\mu^{-}$ pairs. The measured inclusive fiducial cross section of $\sigma(pp \to J/\psi\,J/\psi\,J/\psi\,X)= 272^{+141}_{-104} \text{(stat)} \pm 17 \text{(syst)}$ fb is compared to theoretical expectations for the production of three $J/\psi$ mesons in single- (SPS), double- (DPS), and triple- (TPS) parton scatterings. Assuming factorization of multiple hard-scattering probabilities in terms of SPS cross sections, the measured process is found to be dominated by DPS and TPS contributions, and an effective DPS cross section, related to the transverse distribution of partons in the proton, of $\sigma_{eff,DPS} = 2.7^{+1.4}_{-1.0} \text{(exp)} ^{+1.5}_{-1.0} \text{(theo)}$ mb is determined.
DOI: https://doi.org/10.22323/1.414.0842
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access